Coulthard warns heads will roll if Williams B-spec FW48 upgrade misfires in Baku

David Coulthard has warned that Williams could face significant personnel consequences if its major FW48 upgrade package fails to produce an immediate performance gain at the Azerbaijan Grand Prix in Baku.

The Grove team arrives in Azerbaijan carrying one of the most substantial upgrade packages it has introduced this season — one that team principal James Vowles has described as creating an almost B-spec car. Despite fielding Carlos Sainz and Alex Albon, Williams sits ninth in the constructors’ championship with just 11 points after 14 rounds: six from Sainz and five from Albon.

“I believe, having spoken to some members of the team, that it is a significant step in terms of the car will now be on weight, which we know 10kg is worth three to four tenths of a second around a lap,” Coulthard said on the Up To Speed podcast. “So carrying weight is just putting yourself on the back foot.”

The former McLaren driver drew a comparison with Aston Martin’s mid-season resurgence, suggesting Williams could enjoy a similar leap if the upgrade performs as intended. “There was a notable step forward in their performance when they brought their B-spec car,” Coulthard said of Aston Martin. “And if it doesn’t happen, of course there’s going to be some heads rolling, isn’t there?”

Coulthard also noted that some of the aerodynamic changes are aligned with next year’s regulations, particularly around the front of the floor, meaning the package serves a dual purpose in bridging development toward 2026.

On track in Baku, early signs were modest. Sainz and Albon ended the first practice session 12th and 13th respectively, before slipping to 17th and 16th in the second session — results that will only sharpen the scrutiny on the upgrade’s true potential when it matters most.